1.定义法应用n级行列式的定义计算其值的方法,称为定义法.由定义可知n级行列式的展开式有n!项,计算量很大,一般情况下慎用此法.它主要用于行列式中许多元素为零的情况.此法常见故不举例说明,但要注意的是在应用定义法求非零元素乘积项时,不一定从第一行开始,哪一行非零元素最少就从哪一行开始.2.化三角形法 1. Definition Method The method of calculating the value of a n-level determinant is called the definition method. It can be seen from the definition that the n-term expansion of a n-level determinant has a large amount of computation and is generally used with caution. It is mainly used in the case of many elements of the determinant is zero.This method is not common, so it should be noted that in the application of the definition of non-zero elements of product terms, not necessarily from the first line, which line is not At least the zero element from which line .2. The triangle method